ABO Exam Practice Test - Practice Exam & Study Guide for the American Board of Opticianry

Polarized lenses are designed to filter out certain types of light, specifically light rays that are horizontally polarized. This is because horizontal light rays tend to create glare when reflected off of flat surfaces such as water or snow. Polarized lenses are able to block out these horizontal light rays, thus reducing glare and increasing visual clarity. Therefore, the answer of B. Horizontal is correct as it describes the direction of the light being filtered. The other options are incorrect as they do not accurately describe the direction of the light being filtered and may cause confusion. For example, C. Diagonal and D. Curved are not considered specific directions of light, and A. Vertical refers to the direction of the polarizing film within the lens, not the direction of the light being filtered.